Motor driven switch



K MULLER 22%,804 MOTOR DRIVEN SWITCH Filed Oct. 21, 1957 INVENTOR.

ATTORNEY.

v KO'RAD MULLER gzzzflg Patented May 14, 1940 signor to Siemens & Halske Aktiengesellschaft, Wernerwerk, Siemensstadt, near Berlin, Germany Application October 21, 1937, Serial No. 170,166

. In Germany October 26, 1936 I Claims.

Circuit arrangements for the step-by-step control of motor driven switching devices in which a locking circuit over the energizing winding of the motor is subject to the influence-of the im- 5 pulse relay which transmits the stepping impulses and is also subject to the influence of an auxiliary relay dependent upon the said impulse relay, are well known.

The present development is concerned with the dependence of this auxiliary relay on the actual position of the motor armature.

The present development consists in that the auxiliary relay is influenced mechanically by the motor armature so that the armature of the auxiliary relay is mechanically pressed against the auxiliary relay by the armature of the motor.

By means of a cam disc on the motor shaft which may also serve as an ofi-normal cam, the armature of the auxiliary magnet is pressed against the magnet on each step of the motor by way of a cam spring cooperating with the cam disc the contacts of the auxiliary magnet being thereupon operated.

The present proposal resultsin a more-eflicient operation than with the arrangement in which the auxiliary arrangement is electrically dependent i. e., a more certain operation of the auxiliary magnet takes place thereby insuring an eflicient step-by-step advancing of the motor even when the stepping impulses are distorted.

In addition the new arrangement has the advantage that on account of the mechanical operation of the armature the auxiliary magnet can be made very small since the armature is not attracted by the relay but only needs to be held in position by it.

In the drawing various embodiments of the invention are shown in Figs. 16. The invention is not limited to these embodiments. Only those details which enable the invention to be understood have been shown.

Fig. 1 shows diagrammatically the construction of the new arrangement, while in Figs. 2-6 the new arrangement is shown incorporated in the circuit of a motor switch.

In Fig. 1 the energizing windings of the motor are indicated by the references i and .2. Through the alternate energization of these energizing windings the armature 3 of the motor is set in rotation in the manner described in the Patent No. 1,978,700 granted October 30, 1934 to Fritz Doring and Konrad Miiller. 4 represents a cam disc disposed on the shaft, this serving at the same time as an off-normal cam and influencing the spring 8 which presses the armature 6 of the magnet 5 against the magnet. The spring 8 is shown in Fig. 1 in the position in which it presses the armature against the auxiliary magnet. By this pressure of the armature against the magnet, contacts 10 i. e., contacts of the auxiliary magnet 5 are operated at the same time. The arrangement which is diagrammatically shown is disposed on the plate indicated by the reference 9.

The mode of operation of this arrangement will first be described with reference to the circuit shown in Fig. 2. MI and MII represent the energizing windings of the motor while the reference EK2 indicates the auxiliary magnet. The reference n7c2 indicates cam contacts which are operated by the armature shaft of the motor and subject the windings of the motor to current alternately.

When the impulse receiving relay A2 (not shown) energizes a locking circuit is established for the energizing windings of the motor over contact Ia2, so that upon the operation of the contacts 202, which belongs to a relay V2 (not shown, but which, as is well known, energizes under control of the impulse receiving relay and remains energized throughout the reception of impulses) no rotation of the armature can take place. This is impossible, as explained in the before-mentioned patent, because the two motor windings MI and MII are connected in parallel and energized together; accordingly the rotation of the armature is initiated by the release of relay A2 at the end of the first impulse, when contact [a2 is opened. Winding MI, then energized alone, pulls the armature through its first quarter revolution, and at (or near) the end of this the contacts nkZ are switched over to energize winding MII. If, by the time contacts nlcZ are switched over, the impulse receiving relay has been operated by the second impulse of the series, the locking circuit over contact 1:12 will again be closed, and, due to windings MI and MII being again energized together, a static field will be produced which will have no tendency to rotate the armature further; therefore spring 8 acting upon one of the notches of the cam 4 will hold the armature in that position until the end of the second impulse when contact la2 opens and disconnects the motor winding MI. If, on the other hand, the second impulse has not been received by the end of the first quarter revolution when the contacts n7c2 switch over, a temporary locking circuit is effective which extends over contacts 3a2, 4ek2 and the low resistance winding of magnet EKZ. In this circuit contact 4elc2 is closed by the cam 4 during the first quarter revolution of the armature, and, once closed, is held closed by the auxiliary magnet EKZ in series with the motor magnet winding MI until contact 302 is opened upon reception of the second impulse. The winding of the auxiliary magnet EKZ is then also deenergized and contact 46102 opens again. The mentioned locking circuit is then set up over contact I02 and only after the opening of this locking circuit by the release of relay A2 and the opening of contact [a2 does the motor commence to make the next stepwhich takes place in the manner previouslydes'cribed. Since each forward step of the motor is initiated by the release of relay A2, the operation of the motor depends solely upon the termination of each impulse'ofthe series of received impulses, and itwilhbe seen that its operation will be reliable despite variations in the length of the or in the which-they are sepia;

length of the interval by rated.

This arrangement may be reversed in that the individual steps are not tallteniim the -relase 'ot relay A2 but when this relay energizes-. Such an arrangement is shown in Fig. 3.

In Fig. 3 the energizing windings of the motor contact M3 and the operating contact 8113, con- 7 tact 5ek3 being closed in the manner already described. Since contact 6113 is already closed the locking circuit is set up' for the auxiliary magnet EK3 so that the armature is held by the auxiliary magnet. The locking circuit is only broken-when relay A3 releases since contact 5ek3 has previously been closed, so that the next step can be made.

Since the 'cam'spring (8 in Fig. 1). is to serve at the'same time as a rest spring the system can be arranged so that on the termination of a step the spring falls into'the notch in the cam disc although the auxiliary coil is still energized and the-ck contact (5ek3 'in Fig. 3) remains closed. The auxiliary magnetmay be made small-because it does not have to operate to close the contact but only to hold the operated armature in its operated position.

Fig. 4 shows fundamentally the same arrangement as Fig. 2 with the (inference that the latter figure shows how the contacts of the impulse relay indicated by A4, namely the contacts IBM and a4, which serve tocontrol the individual stepping can be used at the same time to control the vertical selection. This controlis effected over the leads l2 and [3 when the contacts Mud and l5u4' of the switching over relay U4: (not shown) which energizesafter the vertical selection are opened. The auxiliary magnet has the reference EK land its contact l6ek4. After the system has been connected up by contact l'lvd it operates in the same manner as in the case of the arrangement according to Fig. 2.

Fig. 5 shows a circuit which has been modified so that the releasing of the armature of the auxiliary magnet EK5 is not promoted by the interruption .of the locking circuit over the auxiliary magnet by means of a contact of the impulse relay A5.

The auxiliary magnet EK5 is deenergized by being short-circuited over the existing contact 20115. The locking circuit for the auxiliary magnet EK5 is completed over its contact 2lek5. In this case the system is brought into operation by contact 22115. The damping effect on the release of the armature of the auxiliary magnet, when vantage. 'viously disposed in series of the ek contact constitutesz a' saving and is more eflicient because,

its winding is short-circuited, is small on account of the small dimensions of the auxiliary magnet system and thus does not constitute a disad- The omission of the a-contact preinter alia, chattering can take place at this a contact.

on' the-energiz'ing ofthe impulse relay, indicated in'- this ca se by A6, i. e., on the opening of contact 30a6. The contact of the auxiliary magnet EKG is indicated by 3lek6. This arrangement is operatedby'contact 32126. Whatis claimed is:

1. In an arrangement for controlling the.

ste'ppingof a switch, a shaft having an armature and a-cam each attached thereto, motor magnets disposed perpendicular to each other and to the shaft, means for causing the rotation of said armature by the alternate energization' of said magnets to step the switch, an auxiliary relay having an armature and contacts, mechanical means controlled by said cam for operating the armature of said relay each time the switch steps, and means eflective to permit the energiz'ation of said relay over said contacts to hold its armature operated-and prevent further operation of said cam by said magnets.

2. Ina circuit arrangement for controlling the opertion of a high speed stepping switch, motor magnets, a motor armature commonto the magnets for causing the switch to step, means for causing the operation of the armature by alternate energization of the magnets, an auxiliary relay having an armature and'contacts mechanically operated each time the switch steps, and means effective at certain times over said contacts for causing said relay to hold its armature operated and prevent further operation of said motor armature by said magnets.

3. In a circuit arrangement for controlling the operation of a high speed stepping switch, motor magnets, a motor armature common to the magnets for causing the switch to step, means for causing the operation of the armature by alternate energization of the magnets; an auxiliary relay having an armature and contacts mechanlto render said magnets inefiective, said impulsing means effective at another time to cause the release of said relay and to maintain said magnets ineffective.

4. In a circuit arrangement for controlling the operation of a high speed-stepping switch, motor magnets, a motor armature common to the magnets for causing the switch to step, means for causing the operation of the armature by alternate energization of the magnets, an auxiliary relay having an armature and contacts mechanically operated each time the switch steps, said contacts operated to establish a circuit through said relay for holding said armature and contacts thereof operated and for controlling the further operation of said magnets.

5. In a circuit arrangement as claimed in claim 4, means operated to simultaneously-cause the release of said relay and maintain said control over the further operation of said magnets.

KONRAD MUI" LER. 

